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BUG: KCSAN: data-race in binder_thread_read / do_signal_stop

write to 0xffff8880aaa6c024 of 4 bytes by task 24777 on cpu 1:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 binder_wait_for_work drivers/android/binder.c:4083 [inline]
 binder_thread_read+0xa53/0x4460 drivers/android/binder.c:4216
 binder_ioctl_write_read+0x195/0x6d0 drivers/android/binder.c:4867
 binder_ioctl+0x26e/0xde0 drivers/android/binder.c:5031
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xc9/0x130 fs/ioctl.c:760
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:760
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880aaa6c024 of 4 bytes by task 24776 on cpu 0:
 task_set_jobctl_pending kernel/signal.c:291 [inline]
 do_signal_stop+0x32e/0x6d0 kernel/signal.c:2354
 get_signal+0x10c8/0x1650 kernel/signal.c:2703
 do_signal+0x25/0x270 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:212 [inline]
 __prepare_exit_to_usermode+0x127/0x230 arch/x86/entry/common.c:246
 prepare_exit_to_usermode+0x5/0x20 arch/x86/entry/common.c:277
 idtentry_exit_cond_rcu+0xe/0x30 arch/x86/entry/common.c:649
 sysvec_apic_timer_interrupt+0xc6/0xd0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24776 Comm: syz-executor.4 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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